expecting junk,junkbus to be 1 at T=1
then changing to 0 at T=2
then junk is 0 from T=3 to T=11, while
junkbus changes to 2 at T=5 and remains 2 through to T=16
junk changes to 2 at T=12
then 2 from T=13 to T=14
then changing to 3 at T=15
then 3 from T=16 on
junkbus changes to 3 at T=17 and remains 3 from then on

time: 0, a: 01, junk: 01, junkbus: 01
time: 1, a: 01, junk: 01, junkbus: 01
time: 2, a: 01, junk: 00, junkbus: 00
time: 3, a: 01, junk: 00, junkbus: 00
time: 4, a: 01, junk: 00, junkbus: 00
time: 5, a: 10, junk: 00, junkbus: 10
time: 6, a: 10, junk: 00, junkbus: 10
time: 7, a: 10, junk: 00, junkbus: 10
time: 8, a: 10, junk: 00, junkbus: 10
time: 9, a: 10, junk: 00, junkbus: 10
time: 10, a: 10, junk: 00, junkbus: 10
time: 11, a: 10, junk: 00, junkbus: 10
time: 12, a: 10, junk: 10, junkbus: 10
time: 13, a: 10, junk: 10, junkbus: 10
time: 14, a: 10, junk: 10, junkbus: 10
time: 15, a: 11, junk: 11, junkbus: 10
time: 16, a: 11, junk: 11, junkbus: 10
time: 17, a: 11, junk: 11, junkbus: 11
time: 18, a: 11, junk: 11, junkbus: 11
time: 19, a: 11, junk: 11, junkbus: 11

	--------- force test passed ---------